ExploitedIn CISA KEV

CVE-2017-6736

Exploitation confirmed. First attested on 2022-03-03 by CISA-ADP, CISA KEV, GCVE · kevintel.

Published2017-07-17
WeaknessCWE-119

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow an authenticated, remote attacker to remotely execute code on an affected system or cause an affected system to reload. An attacker could exploit these vulnerabilities by sending a crafted SNMP packet to an affected system via IPv4 or IPv6. Only traffic directed to an affected system can be used to exploit these vulnerabilities. The vulnerabilities are due to a buffer overflow condition in the SNMP subsystem of the affected software. The vulnerabilities affect all versions of SNMP - Versions 1, 2c, and 3. To exploit these vulnerabilities via SNMP Version 2c or earlier, the attacker must know the SNMP read-only community string for the affected system. To exploit these vulnerabilities via SNMP Version 3, the attacker must have user credentials for the affected system. A successful exploit could allow the attacker to execute arbitrary code and obtain full control of the affected system or cause the affected system to reload. Customers are advised to apply the workaround as contained in the Workarounds section below. Fixed software information is available via the Cisco IOS Software Checker. All devices that have enabled SNMP and have not explicitly excluded the affected MIBs or OIDs should be considered vulnerable. There are workarounds that address these vulnerabilities.

Timeline

dates in UTC

2017-07-1721:29CVE publishedNVD
2022-03-03Listed as exploited by GCVEGCVE
2022-03-03Exploitation first reportedCISA KEV
2022-03-03Added to the CISA KEV catalogCISA KEV
2024-11-0817:37SSVC exploitation set to activeCISA-ADP
2026-10-2319:23First public proof of conceptPoC-in-GitHub
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2017-6736?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-6736?format=csv
TAXII collection of exploited CVEs
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Versions per branch

NVD

Cisco ios

Branch	Affected	Fixed in	Source
12.x	≥ 12.0, ≤ 12.4	no fix published	NVD
15.x	≥ 15.0, ≤ 15.6	no fix published	NVD

Cisco ios xe

Branch	Affected	Fixed in	Source
3.17	≥ 2.2.0, ≤ 3.17	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-17-208-04 CISA6 known affected
Rockwell Automation Allen-Bradley Stratix and ArmorStratix
Allen-Bradley Stratix 5410 Industrial Distribution Switches: All Versions 15.2(5)EA.fc4 and earlier · Allen-Bradley Stratix 5900 Services Router: All Versions 15.2(5)EA.fc4 and earlier · Stratix 8300 Modular Managed Ethernet Switches: All Versions 15.2(5)EA.fc4 and earlier · +3 more

Full record on NVD

Fix

CISA’s required action: Apply updates per vendor instructions.due 2022-03-24
Mitigation from the vendor CISA ICSA-17-208-04 · 6 productsAccording to Rockwell Automation, multiple Cisco Systems, Inc. vulnerabilities in the Simple Network Management Protocol (SNMP) subsystem of Cisco IO and IOS XE software have been identified which affect certain products in the Allen-Bradley Stratix and ArmorStratix product lines.
Mitigation from the vendor CISA ICSA-17-208-04 · 6 productsFor more information about the SNMP vulnerabilities identified by Cisco, see their advisory
Mitigation from the vendor CISA ICSA-17-208-04 · 6 productsRockwell Automation recommends users of affected products consult the suggestions below and, when possible, employ multiple strategies to mitigate their risk
Mitigation from the vendor CISA ICSA-17-208-04 · 6 productsFor the Stratix 8300 Product Family, Catalog Numbers 1783-RMS, Rockwell Automation suggests updating to v15.2(4a)EA5 or later.
Mitigation from the vendor CISA ICSA-17-208-04 · 6 productsRockwell Automation has provided interim compensating controls for the remaining Allen-Bradley Stratix and ArmorStratix switches to help reduce the risk of exploitation of these vulnerabilities. Rockwell Automation encourages users to evaluate the compensating controls provided below and apply the …
Mitigation from the vendor CISA ICSA-17-208-04 · 6 productsDisable the following Management Information Bases (MIBs) on a device, if they are installed/active on the Stratix device

Advisories and patches

sec.cloudapps.cisco.comVendor Advisory
tools.cisco.comVendor Advisory

Detection

read 2026-10-23 19:23 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 3 repositories, unverifiedmsztankowski/CiscoIOSSNMPToolkitplyrthn/CiscoIOSSNMPToolkitplyrthn/CiscoSpectreTakeover

CISA Known Exploited Vulnerability

Date Added: 2022-03-03
Patch Due Date: 2022-03-24
Ransomware Use: Unknown
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2022-03-03
GCVEexploitation2022-03-03
CISA-ADPSSVC decisionactive2024-11-08
OpenCVESSVC decisionactive—
NVDCVSS 3.18.8read 2026-10-23
CNACVSS 3.08.8read 2026-10-23
NVDCVSS 2.09read 2026-10-23
CNAweakness (CWE)CWE-119read 2026-10-23
NVDweakness (CWE)CWE-119read 2026-10-23
FIRST EPSSEPSS score70.4 %read 2026-10-23
PoC-in-GitHubproof of concept3read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2017-07-17
Last Modified: 2026-06-17
NVD status: Analyzed

Frequently asked questions

What is CVE-2017-6736?

Is CVE-2017-6736 actively exploited?

Yes. CVE-2017-6736 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-03-24.

What is the CVSS score for CVE-2017-6736?

CVE-2017-6736 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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